#include <stdio.h>

int main(void)

{
	double vx,vy;
	puts("请输入两个数。");
	printf("实数vx:"); scanf("%lf",&vx);
	printf("实数vy:"); scanf("%lf",&vy);

	printf("vx+vy=%f\n",vx+vy);
	printf("vx-vy=%f\n",vx-vy);
	printf("vx*vy=%f\n",vx*vy);
	printf("vx/vy=%f\n",vx/vy);

	return (0);
}
